Citation: Yuyan Du, Jinxia Cai, Tianyu Li, Yandong Hu, Haibo Zhang, Bing Xie. High-temperature dielectric composite with excellent capacitive energy storage by multiscale chemical configuration design[J]. Chinese Chemical Letters, ;2026, 37(7): 111775. doi: 10.1016/j.cclet.2025.111775 shu

High-temperature dielectric composite with excellent capacitive energy storage by multiscale chemical configuration design

Yuyan Du ^a ,
Jinxia Cai ^b ,
Tianyu Li ^{c, d, *,} ,
Yandong Hu ^a ,
Haibo Zhang ^e ,
Bing Xie ^{a, *,}

a.
School of Power and Energy, Jiangxi Key Laboratory of Green General Aviation Power, Nanchang Hangkong University, Nanchang 330063, China
b.
Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China
c.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
d.
Department of Physics, City University of Hong Kong, Hong Kong, China
e.
School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

tianyuli@ustb.edu.cn

xieb@nchu.edu.cn

Received Date: 9 July 2025
Revised Date: 16 August 2025
Accepted Date: 29 August 2025
Available Online: 29 August 2025

Figures(5)

Polymer dielectric capacitors are crucial for advanced power electronics but are often limited by the trade-off among energy density, efficiency, and thermal stability under high electric fields. To overcome these challenges, we propose a multiscale chemical configuration design strategy by constructing a ternary composite comprising high glass transition temperature fluorene polyester (FPE), polyetherimide (PEI), and high-aspect-ratio γ-Al₂O₃ nanosheets (AO NS). At the molecular scale, the structural compatibility between FPE and PEI enables homogeneous blending, while the incorporation of PEI increases free volume, enhances dipolar mobility, and preserves low dielectric loss. At the nanoscale, AO NS act as ceramic barriers to suppress charge injection, raise interfacial polarization, and stabilize the local electric field. At the device level, this hierarchical design leads to synergistic improvements in dielectric properties, insulation, and energy storage performance. As a result, the optimized composite achieves excellent high-temperature energy-storage capability, characterized by a high energy density of 5.51 J/cm³ with above 80% efficiency at 150 ℃ and 550 MV/m. This study paves a practical and scalable path toward high-performance polymer dielectrics for reliable energy storage under extreme thermal and electrical conditions.
- Dielectric capacitors,
- High temperature,
- Inorganic-polymer composite,
- Free volume,
- Breakdown strength,
- Multiscale chemical design
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沈阳化工大学材料科学与工程学院沈阳 110142